java.lang.ClassCastException when data provider output is list and field is not a String

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.1.10 DXP FP26, 7.1.10.7 SP7, 7.1.X, 7.2.10 DXP FP15, 7.2.X, 7.3.X, 7.4.13 DXP GA1, 7.4.3.4 CE GA4, Master
• Component/s: Forms
• Labels:
  • backend_test
  • forms_customer_demand
  • liferay-dxp-71-sp7
  • liferay-fixpack-dxp-15-7210
  • liferay-fixpack-dxp-26-7110
• Branch Version/s:
  7.3.x, 7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 5
• Git Pull Request: https://github.com/liferay-forms/liferay-portal/pull/909

Steps to reproduce

1. Allow Access Local Network in System Settings > Data Provider
2. Create a new data provider named DP
   1. URL: http://localhost:8080/api/jsonws/country/get-countries
   2. Output name: position, path $..position and type List;
3. Create a new form F
   1. add a field of type Select from List
   2. in the Basic tab of the Select field choose From Data Provider in the Create List selector
   3. Choose DP as the Data Provider
   4. Choose position as Output Parameter
4. Save the form
5. Publish the form
6. Go to the Form URL

Expected behavior

A list of zeroes is shown in the select from list field

Current behavior

No option is shown in the select from list field and the following stacktrace can be seen in the logs:

2021-09-07 12:09:36.942 WARN  [http-nio-9132-exec-6][DDMDataProviderInvokerImpl:62] Unable to invoke DDM Data Provider instance ID 43143
com.netflix.hystrix.exception.HystrixRuntimeException: DDMDataProviderInvokeCommand#eesti failed and no fallback available.
	at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:822) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$22.call(AbstractCommand.java:807) ~[?:?]
	at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:140) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$DeprecatedOnFallbackHookApplication$1.onError(AbstractCommand.java:1472) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$FallbackHookApplication$1.onError(AbstractCommand.java:1397) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at rx.observers.Subscribers$5.onError(Subscribers.java:230) ~[?:?]
	at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44) ~[?:?]
	at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onError(OperatorOnErrorResumeNextViaFunction.java:142) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$HystrixObservableTimeoutOperator$3.onError(AbstractCommand.java:1194) ~[?:?]
	at rx.internal.operators.OperatorSubscribeOn$1$1.onError(OperatorSubscribeOn.java:59) ~[?:?]
	at rx.observers.Subscribers$5.onError(Subscribers.java:230) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onError(OnSubscribeDoOnEach.java:87) ~[?:?]
	at rx.observers.Subscribers$5.onError(Subscribers.java:230) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$DeprecatedOnRunHookApplication$1.onError(AbstractCommand.java:1431) ~[?:?]
	at com.netflix.hystrix.AbstractCommand$ExecutionHookApplication$1.onError(AbstractCommand.java:1362) ~[?:?]
	at rx.observers.Subscribers$5.onError(Subscribers.java:230) ~[?:?]
	at rx.observers.Subscribers$5.onError(Subscribers.java:230) ~[?:?]
	at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:44) ~[?:?]
	at rx.internal.operators.OnSubscribeThrow.call(OnSubscribeThrow.java:28) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:51) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:41) ~[?:?]
	at rx.internal.operators.OnSubscribeDoOnEach.call(OnSubscribeDoOnEach.java:30) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[?:?]
	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[?:?]
	at rx.Observable.unsafeSubscribe(Observable.java:10151) ~[?:?]
	at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94) ~[?:?]
	at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:56) ~[?:?]
	at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction$1.call(HystrixContexSchedulerAction.java:47) ~[?:?]
	at com.netflix.hystrix.strategy.concurrency.HystrixContexSchedulerAction.call(HystrixContexSchedulerAction.java:69) ~[?:?]
	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55) ~[?:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
	at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[?:?]
	at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: com.liferay.dynamic.data.mapping.data.provider.DDMDataProviderException: java.lang.ClassCastException: class java.lang.Double cannot be cast to class java.lang.String (java.lang.Double and java.lang.String are in module java.base of loader 'bootstrap')
	at com.liferay.dynamic.data.mapping.data.provider.internal.rest.DDMRESTDataProvider.getData(DDMRESTDataProvider.java:109) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.DDMDataProviderInvokeCommand.run(DDMDataProviderInvokeCommand.java:80) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.DDMDataProviderInvokeCommand.run(DDMDataProviderInvokeCommand.java:35) ~[?:?]
	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302) ~[?:?]
	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46) ~[?:?]
	... 26 more
Caused by: java.lang.ClassCastException: class java.lang.Double cannot be cast to class java.lang.String (java.lang.Double and java.lang.String are in module java.base of loader 'bootstrap')
	at com.liferay.dynamic.data.mapping.data.provider.internal.rest.DDMRESTDataProvider.createDDMDataProviderResponse(DDMRESTDataProvider.java:200) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.rest.DDMRESTDataProvider.doGetData(DDMRESTDataProvider.java:316) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.rest.DDMRESTDataProvider.getData(DDMRESTDataProvider.java:88) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.DDMDataProviderInvokeCommand.run(DDMDataProviderInvokeCommand.java:80) ~[?:?]
	at com.liferay.dynamic.data.mapping.data.provider.internal.DDMDataProviderInvokeCommand.run(DDMDataProviderInvokeCommand.java:35) ~[?:?]
	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:302) ~[?:?]
	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:298) ~[?:?]
	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46) ~[?:?]
	... 26 more

Additional notes

In 7.3.x there's no position in the countries' data and stacktrace won't be seen in the logs unless com.liferay.dynamic.data.mapping.data.provider.internal.DDMDataProviderInvokerImpl has log level of at least WARN, but the behavior is the same under the hood.

Reproduced on master @ 4bc11e114e0e1c29363855f50d7f859796b44857
Reproduced on 7.3.x @ 096f06d69804625bfb798e66e356e967ad342d6e
Reproduced on 7.2.x @ a06cde0441958e572dba142dfe1fef24a0c1ff02
Reproduced on 7.1.x @ a4793db3caac0a50135d3d7e6081bf7dc69bb2f4